Hi, I'm new to the guitar, I've been learning for about three weeks now using GuitarTricks as my main learning source. Im looking for some advice about learning using the tutorials.

As a rule of thumb should I be learning the material by heart before continuing to the next lesson? Right now I am continuing when I am able to play the notes fairly competently by reading it off the notation diagrams. However should I really only be continuing once I do not have to read the diagram anymore?

for example, right now I am on Guitar Fundamentals 1 "Lets Add the Sixth String" and we are learning to play G major scale. Now I can play the G Major quite well by reading it off the Notation. But shall I only be continuing the lesson once I have it memorised by heart? The same goes for the other simple melodies like " Five Miles Out" in previous lessons, shall I only be continuing once I have it memorised by heart?